Renewable-fuse construction



OGL l,` 1929. J. H. HlcKEY I RENEWABLE FUSE CONSTRUCTION Filed Aug. 11, 1927 UNlTEll)` STATES PATENT OFFICE JOHN HAR-RY HICKEY, OF SAN FRANCISGO, CALIFORNIA RENEWABLE-FUSE CONSTRUCTION Application led August 11, 1927.

My invention relates to improvements in renewable fuse construction wherein the ends of a fusible element are arranged to be detachably clamped by removable terminal caps to form an etlicient electrical contact with said caps.

The primary object of my invention is to provide an improved construction for renewable fuses.

Another object is to provide an improved device which will facilitate the placing and renewing of fusible elements in a cartridge fuse.

A further object is to provide an improved device in which an efficient electrical Contact is insured between the fusible element and the terminal caps of the fuse.

A still further object is to provide an improved fuse of the character described of simple and economic construction and which is efficient and durable in service.

I accomplish these and vother objects by means of the improved device disclosed in the drawings forming a part of the present appliction wherein like characters of reference are used to designate similar parts throughout the specification and drawings and in which,

. Fig. 1 is a side elevation, partly in section, of my improved fuse.

Fig. 2 is a section taken upon the line 2-2 of Fig. 1 in the direction indicated.

Fig. 3 is a broken plan view of one end of the fuse, as shown in Fig. 17 the cap only being shown in section.

Referring to the drawings7 the numeral 1 is used to designate in general a cartridge fuse casing having diametrically opposite notches 2 formed at each end thereof and having threads 3 formed upon the ends of the casing.

Bars 4 are mounted across the ends of the casing 1, the ends of said bars being engaged by the notches 2 whereby said bars are held in operative position spanning the ends of the casing. A centrally disposed opening 6 is formed through each bar 4 and grooves 7 are formed in the outer surfaces of each bar 4 to extend from the opening 6 to one end of said bar.

v A fusible element 8 extends through the Serial No. 212,217.

casing, the ends of the element S extending outwardly through the openings G and the outwardly extending end portions 9 of said elements 8 being bent to engage the grooves 7 Set screws 11 are threaded into the bars 4 and arranged to engage and rigidly clamp the fusible element in engagement with the bars. The set screws 11 are preferably arranged to extend longitudinally from the ends of the bars whereby said set screws may be made readily accessible when the bars are in operative position wit-hin the notches 2.

Terminal caps 12 are threaded onto the threads 3 of the casing, said caps being arranged to be screwed onto the ends of the casing to clamp the ends 9 of the fusible element between the bars 4 and the inner surface of the cap w iereby an efficient electrical contact is insured between the caps and the fusible element. The ends 9 of the fusible element are held against turning with the caps 12 by the grooves 7.

The casing l is made of any suitable insulating material and the caps 12 are made of suitable conductive material, as in the ordinary practice, whereby said caps are effectively insulated from each other exceptfor the electrical connection through the fusible element 8.

My improved fuse, constructed as above described, is applied and operates in the ordinary manner. then the fusible element is to be replaced, the caps 12 are unscrewed from the casing 1 and the set screws 1.1 loosened to release the ends of the blown fuse. A fresh fusible element 8 is then inserted through the openings 6 in the bars 4 and the ends 9 bent to engage the grooves 7 after the bars 4 have been properly positioned in engagement with the notches 2. The set screws are then tightened to rigidly hold the fusible element in connection with the bars, said fusible element itself serving to hold the bars 4 in engagement with the casing. The caps 12 are then screwed onto the ends of the casing, said caps being advanced onto the ends of the casing until the ends 9 of the fusible element are effectively clamped between the caps and the bars. l

While I have illustrated and described only lUU the preferred embodiment of my improvements, the device as shown is subject to modi- Ification in various details without departing from the spirit of my invention. l therefore wish to avail myself of all modifications which may fall within the scope of the appended claims.

Having thus described my invention what l claim as new and desire to secure by Letters Patent is:

l. A fuse comprising a casing; bars spanning the ends of the casing; a fusible element extending through the casing and arranged to engage the outer surfaces of the bars; set screws threaded into the bars and transversely to the axis of the casing to engage and rigidly secure the fusible element thereto; and terminal caps engaging the ends of the casing and arranged to engage the ends of the fusible element to form electrical connection therewith.

2. A fuse comprising a casing; a fusible element extending through the casing; bars spanning the ends of the casing and having openings arranged to receive the ends of the fusible element; the ends of said bars being engaged by notches formed in the ends of the casing; set screws threaded into the ends of the bars for securing the fusible element to the bars, said set screws being accessible through the notches in the casing when the bars are seated therein; and terminal caps threaded onto the ends of the casing and arranged to be screwed into clamping engagement with the ends of the fusible element to form electrical contact therewith.

3. A fuse comprising a casing; a fusible element extending through the casing; bars spanning the ends of the casing and having openings arranged to receive the ends of the fusible element and also having grooves arranged upon the outer sides of the bars to receive said ends; and terminal caps threaded onto the ends of the casing and arranged to clamp the ends of the fusible element into the grooves of the bars to form electrical contact.

4. A fusel comprising a casing; a fusible element extending through the casing; bars spanning the'ends of the casing and having openings arranged to-receive the ends of the `fusible element and also having grooves arranged upon the outer surfaces of the bars to receive said ends; means for rigidly securing the fusible element to the bars; and terminal caps threaded onto the ends of the casing and arranged to be screwed into clamping relation with the -ends of the fusible element, said ends being held against turning with the l(gaps by means of the grooves formed in the ars.

5. A fuse comprising a casing having diametrically 4 opposite notches formed in the ends thereof; bars spanning the ends of the casing and having their ends engaged by the notches; a fusible element extending through the casing and having its ends extending outwardly through openings formed in the bars;

set screws threaded into the bars to rigidly secure the fusible element in engagement with the bars; and terminal caps threaded onto the ends of the casing and arranged to be screwed into clamping engagement with the ends of e the fusible element, said ends being held against turning with the caps by grooves formed in the outer surfaces of the bars.

6. A fuse comprising a casing; conductive members mounted across the ends of the casing and having openings therein; a fusible element extending through the casing and through the openings of the conductive members at the ends thereof; set screws threaded into the edges of the conductive members transversely to the axis of the casing and fusible element to enga-ge and rigidly secure the yfusible element thereto; and terminal caps threaded onto the ends of the casing and arranged to engage the ends of the fusible elemeilit and form electrical connections therewit i.

In witness whereof, I hereunto set my signature.

JOHN HARRY- HICKEY. 

